Christina Nakyung Ryu, M.D.
NPI 1518491158ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· San Francisco, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with Sutter Bay Medical Foundation, practicing in San Francisco, California. Their prescriptions cost Medicare Part D more than their services did: $808,384 for 1,210 claims, against $47,016 paid for services in 2024. Sequel Med Tech, LLC reported $27.20 in payments in 2025, mostly food and beverage. Lists California Pacific Medical Center - Mission Bernal and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1518491158 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 19, 2017 |
| Last updated in NPPES | Jul 19, 2022 |
| Certified by provider | Jul 19, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A159726 | CA |
| Internal Medicine | 207R00000X | 12229699 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 149 |
|---|---|
| Services billed | 724 across 15 procedure codes |
| Paid by Medicare | $47,016 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,210 · 2,913 30-day fills |
|---|---|
| Patients | 158 |
| Total drug cost | $808,384 |
| Generic share | 37% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Sutter Bay Medical FoundationFremont, CA · 3,829 clinicians
Hospital affiliations
- California Pacific Medical Center - Mission BernalSan Francisco, CA
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- California Pacific Medical Ctr-Davies Campus HospSan Francisco, CA
- Marinhealth Medical CenterGreenbrae, CA
- Peninsula Medical CenterBurlingame, CA
Industry payments (Open Payments)
- 2025$27.20 · 1 payment from 1 company
- 2024$20.52 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sequel Med Tech, LLC | $27.20 | 1 |
What the 2025 payments were for
- Food and Beverage$27.20 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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